Resources · Guide
How to read a P&L. Without the jargon.
The Profit & Loss statement is the most useful report your bookkeeping produces — and the one most owners glance at and put down. This guide walks through each section without the jargon, what's normal vs. concerning, and the three numbers that actually tell you whether the business is healthy.
8 min read· Twin Cities, Minnesota
The short version
- P&L answers one question: did the business make money in this period? Income minus expenses = profit (or loss).
- Top to bottom flow: Revenue → Cost of Goods Sold → Gross Profit → Operating Expenses → Operating Income → Other Income/Expense → Net Income.
- The three numbers that matter most: Revenue (top line), Gross Margin % (revenue minus COGS, as % of revenue), Net Income (bottom line, profit after everything).
- P&L is not cash. A profitable month can have negative cash flow (slow-paying customers, big inventory order). The Cash Flow Statement is the matching report for cash.
Section 1: Revenue (the top line).
This is everything your business earned for the period — gross sales, before any deductions. Sometimes called “Sales,” “Income,” or just “Revenue.”
What to check:
- Is the number what you’d expect? If you billed $30K last month but the P&L shows $42K, something’s classified wrong (or you forgot about $12K of work).
- If you have multiple revenue streams (services + products, or different service lines), they should each have their own line. “Sales: $45,000” is less useful than “Consulting: $30,000 / Software licenses: $15,000.”
- Refunds and discounts usually appear as a negative line below gross revenue. Net revenue is what counts for tax.
Section 2: Cost of Goods Sold (COGS).
COGS is what it cost to deliver the revenue. For a product business: inventory cost, manufacturing, shipping in. For a service business: subcontractor fees, direct labor on billable work, project-specific materials.
What COGS isn’t: office rent, your salary as owner, marketing, software subscriptions. Those are operating expenses (next section).
What to check:
- COGS as a percent of revenue should be stable month to month. Sudden jump = inventory write-off, mispricing, or cost increase you haven’t passed through.
- If you don’t have any COGS (pure consulting, all owner labor), this section may be empty — that’s fine.
The first key number: Gross Profit / Gross Margin.
Revenue minus COGS = Gross Profit. Gross Profit divided by Revenue = Gross Margin %.
This is the most important number on the page. It tells you how much each dollar of revenue contributes to covering operating expenses and producing profit.
Typical gross margins by industry:
- Software / SaaS: 70–90%
- Professional services: 50–70%
- Restaurants: 60–70% (food cost ~30% of revenue)
- Retail: 30–50%
- Construction / trades: 20–40%
- E-commerce: 30–50% (varies wildly by category)
Your gross margin trending down over time is the earliest warning sign in your books. Catch it early, you can adjust pricing. Catch it late, you’re reactive.
Section 3: Operating Expenses.
Everything it costs to run the business that isn’t directly tied to delivering revenue. Common categories:
- Rent / occupancy
- Office supplies, equipment under $2,500
- Software subscriptions (QuickBooks, Slack, Adobe, whatever)
- Owner / non-COGS payroll (your salary if you’re an S-corp; W-2 employees not on billable work)
- Marketing / advertising
- Insurance
- Professional fees (accountant, attorney, contractors)
- Utilities, phone, internet
- Travel, meals (50% deductible)
- Bank fees, merchant processing fees
What to check: do the totals look right? If software costs jumped from $300 to $1,800, something got reclassified or you signed up for an annual subscription. Each line item should be roughly stable; the spikes are where the questions come from.
The second key number: Operating Income.
Gross Profit minus Operating Expenses = Operating Income (or Operating Loss). This is profit from running the business itself, before any interest, investment income, or one-time items.
Operating income as a percent of revenue is your “operating margin.” A healthy business typically has 10–25% operating margin, depending on industry. Consulting + services tend to be higher; restaurants and retail tend to be lower.
When operating income is positive but small, profitability is fragile — a 10% drop in revenue can flip you to a loss. When it’s consistently above 20%, you have real cushion.
Section 4: Other Income and Expenses.
Below operating income, you’ll see things like:
- Interest income (savings account earning a little)
- Interest expense (loans, line of credit)
- Gain or loss on sale of asset
- One-time items (insurance settlement, legal settlement, grant)
These are real but separate from operating performance. Showing them below the operating-income line keeps the operating margin clean of one-time noise.
The third key number: Net Income.
Operating Income + Other Income / Expenses = Net Income. This is the bottom-line profit for the period.
Net income is what gets reported on your tax return (for a sole prop, it goes on Schedule C; for an S-corp, it’s the basis for K-1 distributions to owners). For most owners, this is the number you check first.
But: net income is an accrual concept. A profitable month can coincide with a tight cash month if customers haven’t paid yet or you stockpiled inventory. To see cash, look at the Cash Flow Statement (or just your bank balance).
What to actually do with your P&L each month.
A useful monthly P&L review takes about 10 minutes:
- Compare this month’s revenue to the same month last year. Trending up, flat, or down?
- Look at gross margin %. Stable? Improving? Eroding?
- Scan operating expense lines for anything that jumped unexpectedly.
- Note net income. Year-to-date is more telling than a single month — especially in seasonal businesses.
- Ask: do these numbers tell a story I can repeat back to my spouse / partner / banker? If not, the categorization probably needs attention.
That’s it. Most owners overthink monthly review or skip it entirely. 10 minutes a month catches problems while they’re still small.
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